Standardise header guards across codebase

All identifiers, regardless of use, that start with two underscores are
reserved. This means they can't be used in header guards.

The style that this project is now to use the full name of the file in
capital letters followed by 'H'. For example, for a file called
"uart_example.h", the header guard is UART_EXAMPLE_H.

The exceptions are files that are imported from other projects:

- CryptoCell driver
- dt-bindings folders
- zlib headers

Change-Id: I50561bf6c88b491ec440d0c8385c74650f3c106e
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/plat/allwinner/common/include/mentor_i2c_plat.h b/plat/allwinner/common/include/mentor_i2c_plat.h
index f547f9a..d03f2d1 100644
--- a/plat/allwinner/common/include/mentor_i2c_plat.h
+++ b/plat/allwinner/common/include/mentor_i2c_plat.h
@@ -6,8 +6,8 @@
  */
 /* This driver provides I2C support for Allwinner sunXi SoCs */
 
-#ifndef SUNXI_I2C_H
-#define SUNXI_I2C_H
+#ifndef MENTOR_I2C_PLAT_H
+#define MENTOR_I2C_PLAT_H
 
 #define CONFIG_SYS_TCLK			24000000
 #define CONFIG_SYS_I2C_SPEED		100000
@@ -25,4 +25,4 @@
 	uint32_t soft_reset;
 };
 
-#endif
+#endif /* MENTOR_I2C_PLAT_H */
diff --git a/plat/allwinner/common/include/plat_macros.S b/plat/allwinner/common/include/plat_macros.S
index 6ee4597..77f183d 100644
--- a/plat/allwinner/common/include/plat_macros.S
+++ b/plat/allwinner/common/include/plat_macros.S
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __PLAT_MACROS_S__
-#define __PLAT_MACROS_S__
+#ifndef PLAT_MACROS_S
+#define PLAT_MACROS_S
 
 #include <arm_macros.S>
 #include <sunxi_mmap.h>
@@ -24,4 +24,4 @@
 	arm_print_gic_regs
 	.endm
 
-#endif /* __PLAT_MACROS_S__ */
+#endif /* PLAT_MACROS_S */
diff --git a/plat/allwinner/common/include/sunxi_def.h b/plat/allwinner/common/include/sunxi_def.h
index da87b23..73c4453 100644
--- a/plat/allwinner/common/include/sunxi_def.h
+++ b/plat/allwinner/common/include/sunxi_def.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __SUNXI_DEF_H__
-#define __SUNXI_DEF_H__
+#ifndef SUNXI_DEF_H
+#define SUNXI_DEF_H
 
 /* Clock configuration */
 #define SUNXI_OSC24M_CLK_IN_HZ		24000000
@@ -18,4 +18,4 @@
 #define SUNXI_SOC_H5			0x1718
 #define SUNXI_SOC_H6			0x1728
 
-#endif /* __SUNXI_DEF_H__ */
+#endif /* SUNXI_DEF_H */